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Globally, كايوس (Kaio , Caius , كايوس) is a common boy's first name. The given name كايوس is habitual in Brazil, where it is quite a common masculine name, Romania, where it is quite a rare primarily male, but scarcely female name, and Portugal, where it is a rare male name. Measured by absolute frequency, it is the most numerous in Brazil, Romania, and Nigeria. Much less frequently, كايوس is the last name as well as the forename.
كايوس is also a name for the fictitious and mythical characters: Caius Camillus , character in Kaamelott and Caius Prenlomnibus , the Asterix character.